SWIFTTDRSS ivo://nasa.heasarc/swifttdrss NASA/GSFC HEASARC Swift Project; HEASARC 2026-04-17 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Observation This database table is derived from the Swift TDRSS messages sent on ground soon after a BAT trigger occurs on-board. For each trigger there are associated up to 14 messages, however not all are always generated and sent on ground. The messages are generated on board by the BAT, XRT and UVOT instruments and the Figure of Merit part of the observatory's autonomy. The BAT and XRT can each have five different message types. The UVOT and FOM can each have two different message types. These TDRSS messages are the results of the on-board data processing of the three instruments and some contain data products. They are first distributed via the GCN and later archived. The BAT messages are: alert, 'ack' containing the position, or 'nack' if the position could not be calculated, a lightcurve and scaled map. The XRT messages are: centroid containing the position, an image (if the position has been calculated), centroid error if the position could not be calculated, spectra in Low Rate Photodiode and Windowed Timing modes, a lightcurve. The UVOT messages are: finding chart containing star positions and a subimage centered on the XRT position. The FOM messages are used to indicate if the FOM will or will not observe the new target and if the spacecraft will (or will not) request a slew for the new target. The parameters in this database table are a collection of high level information taken from the following messages : the BAT alert, 'ack' or 'nack' message, the FOM messages, the XRT position and image. If the information is not available the fields are left blank. All messages are provided as data products within this database table. This database table is generated at the Swift processing site. During operation, it is updated on daily basis. This is a service provided by NASA HEASARC . https://heasarc.gsfc.nasa.gov/W3Browse/all/swifttdrss.html Archive Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=swifttdrss& GET text/xml 180 99999 true 54.80882 -89.03693 0.416666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=swifttdrss GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_swifttdrss&Action=More+Options&Action=Parameter+Search&ConeAdd=1 SWIFT 0.416666666666667 Gamma-ray public swifttdrss Swift TDRSS Messages target_id Unique Trigger Number meta.id;src int nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable "time" Time of the Trigger Detection mjd time.start;obs double nullable trigger_satisfied Index of the Triggers That Have the Highest Significance Level short nullable bat_peak_rate Peak Count Rate Observed During the Integrated Interval ct/s double nullable image_significance Image Detection Significance double nullable master_flag Flag Indicates Presence in Swift Master Catalog char nullable obs_segment Observation Segment int nullable image_trigger Flag Indicates an Image Trigger Occurred char nullable xrt_ra XRT Right Ascension (J2000) degree double nullable bat_back_counts Background Counts ct int nullable source_interesting Flag Indicates Source Is Interesting char nullable bat_phi BAT Phi Angle degree double nullable bat_dec BAT Declination (J2000) degree double nullable time1 Time of the Trigger Detection (Ack/Nack Message) mjd double nullable rate_score_snr1 Rate Score SNR (Ack/Nack Message) double nullable bat_trigger_stop Trigger Stop time to Obtain Total Counts s double nullable rate_dn1 XRT Rate DN double nullable fom_observe Flag Indicates FOM Will Observe char nullable wait_constraint Wait Time Before Constraint s double nullable source_exposure Effective Exposure on Source s double nullable back_exposure Effective Exposure on Background s double nullable xrt_exposure XRT Exposure Image Message s double nullable time_seconds1 Time (in seconds) of the Trigger Detection (Ack/Nack Message) s double nullable bat_ra BAT Right Ascension (J2000) degree double nullable pos_flag Flag Indicates Position Type: 1=BAT, 2=XRT, 0=none short nullable point_source Flag Indicates Point Source char nullable pnt_dec PNT Declination (J2000) degree double nullable rate_score_snr Rate Score SNR double nullable wait_time Wait Time Before Observation s double nullable bii Galactic Latitude degree pos.galactic.lat double nullable num_processed Number of Times a Sequence Has Been Processed within a Processing Version short nullable pnt_roll PNT Roll degree double nullable obsid Unique Observation Number (Target_ID + Obs_Segment) meta.id;meta.main char nullable xrt_dn XRT Total DN double nullable xrt_flux XRT Flux Integrated Over One CCD Frame double nullable catalog_source Flag Indicates Catalog Source char nullable new_at Flag Indicates New FOM AT char nullable processing_date Date of Processing mjd time.processing double nullable trigger_satisfied1 Index of the Triggers That Have the Highest Significance Level (Ack/Nack Msg.) short nullable xrt_dec XRT Declination (J2000) degree double nullable bat_theta BAT Theta Angle degree double nullable pnt_ra PNT Right Ascension (J2000) degree double nullable ucft_corr UCFT Correction (in seconds) s double nullable rate_dn XRT Rate DN double nullable lii Galactic Longitude degree pos.galactic.lon double nullable processing_version Version of Processing Script char nullable rate_score1 Rate Score (Ack/Nack Message) double nullable rate_score Rate Score double nullable time_seconds Time of the Trigger Detection (in seconds) s double nullable sc_observe Flag Indicates SC Will Observe char nullable merit Flag Indicates FOM Merit char nullable source_is_grb Flag Indicates Source Is a Gamma-Ray Burst char nullable xrt_time Start Time of the XRT Integration Used to Determine XRT Position mjd double nullable bat_net_counts Net Counts ct int nullable xrt_pos_err XRT Position Error double nullable bat_tot_counts Total Counts ct int nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable